Ms. Swisher spoke to the two partners who are heading up the office when it opens in September, Danny Rimer and Mike Volpi.

“We thought we would be better positioned to support our entrepreneurs by being in Silicon Valley,” said Volpi, who left the area when he became CEO of the then-hyped Joost premium online video service. “Having two solid investors from Index on the West Coast was important, as opposed to a chipshot.”

Volpi noted that of Index’s $1.3 billion in investments in 173 companies, $400 million was in 58 U.S.-based start-ups. In addition, the firm had helped another 35 move here.

There are currently nine investing partners at Index, which is actually headquartered in Geneva, Switzerland.

Rimer noted that initially it will just be him and Volpi here, as well as some support staff. But it was likely they would expand their office, which will be located in either San Francisco or around Palo Alto, Calif.

“It has been a challenge to be a European firm and also be present in the Valley and be considered an insider here,” said Rimer, who often traveled to California. “There is a lot to have an immediate ability to be face-to-face with our companies.”

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Tech Europe covers Europe’s technology leaders, their companies, and the people and industries that support them — and their ideas. The blog is edited by Ben Rooney, with contributions from The Wall Street Journal and Dow Jones Newswires.